William J Post - Net Worth and Insider Trading
William J Post Net Worth
The estimated net worth of William J Post is at least $10 Million dollars as of 2025-04-25. William J Post is the Director of Pinnacle West Capital Corp and owns about 68,762 shares of Pinnacle West Capital Corp (PNW) stock worth over $6 Million. William J Post is also the Director of First Solar Inc and owns about 24,207 shares of First Solar Inc (FSLR) stock worth over $3 Million. Details can be seen in William J Post's Latest Holdings Summary section.
Disclaimer: The insider information is derived from SEC filings. The estimated net worth is based on the final shares held after open market or private purchases and sales of common stock with a transaction code of "P" or "S" on Form 4, assuming that William J Post has not made any transactions after 2023-05-16 and currently still holds the listed stock(s). Please note that this estimate may not reflect the actual net worth.

Transaction Summary of William J Post
William J Post Insider Ownership Reports
Based on ownership reports from SEC filings, as the reporting owner, William J Post owns 3 companies in total, including First Solar Inc (FSLR) , Knight-Swift Transportation Holdings Inc (KNX) , and Pinnacle West Capital Corp (PNW) .
Click here to see the complete history of William J Post’s form 4 insider trades.
Insider Ownership Summary of William J Post
Ticker | Company | Transaction Date | Type of Owner |
---|---|---|---|
FSLR | First Solar Inc | 2023-05-16 | director |
KNX | Knight-Swift Transportation Holdings Inc | 2010-12-15 | director |
PNW | Pinnacle West Capital Corp | 2009-12-14 | director & CEO & Chairman of the Board |
William J Post Latest Holdings Summary
William J Post currently owns a total of 2 stocks. Among these stocks, William J Post owns 68,762 shares of Pinnacle West Capital Corp (PNW) as of December 14, 2009, with a value of $6 Million and a weighting of 66.3%. William J Post also owns 24,207 shares of First Solar Inc (FSLR) as of May 16, 2023, with a value of $3 Million and a weighting of 33.7%.
Latest Holdings of William J Post
Ticker | Company | Latest Transaction Date | Shares Owned | Current Price ($) | Current Value ($) |
---|---|---|---|---|---|
PNW | Pinnacle West Capital Corp | 2009-12-14 | 68,762 | 94.48 | 6,496,634 |
FSLR | First Solar Inc | 2023-05-16 | 24,207 | 136.44 | 3,302,803 |
Holding Weightings of William J Post
William J Post Form 4 Trading Tracker
According to the SEC Form 4 filings, William J Post has made a total of 0 transactions in Pinnacle West Capital Corp (PNW) over the past 5 years. The most-recent trade in Pinnacle West Capital Corp is the sale of 79,201 shares on December 14, 2009, which brought William J Post around $3 Million.
According to the SEC Form 4 filings, William J Post has made a total of 1 transactions in First Solar Inc (FSLR) over the past 5 years, including 0 buys and 1 sells. The most-recent trade in First Solar Inc is the sale of 10,000 shares on May 16, 2023, which brought William J Post around $2 Million.
Insider Trading History of William J Post
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William J Post Trading Performance
William J Post Ownership Network
Ownership Network List of William J Post
Ownership Network Relation of William J Post

William J Post Owned Company Details
What does First Solar Inc do?
Who are the key executives at First Solar Inc?
William J Post is the director of First Solar Inc. Other key executives at First Solar Inc include Chief Mfg. Engineering Officer Kuntal Kumar Verma , EVP & HR & Communications Caroline Stockdale , and Chief Operating Officer Georges Antoun .
First Solar Inc (FSLR) Insider Trades Summary
Over the past 18 months, William J Post made no insider transaction in First Solar Inc (FSLR). Other recent insider transactions involving First Solar Inc (FSLR) include a net sale of 13,572 shares made by Georges Antoun , a net sale of 13,080 shares made by Kuntal Kumar Verma , and a net sale of 7,445 shares made by Markus Gloeckler .
In summary, during the past 3 months, insiders sold 37,861 shares of First Solar Inc (FSLR) in total and bought 0 shares, with a net sale of 37,861 shares. During the past 18 months, 169,425 shares of First Solar Inc (FSLR) were sold and 0 shares were bought by its insiders, resulting in a net sale of 169,425 shares.
First Solar Inc (FSLR)'s detailed insider trading history can be found in Insider Trading Tracker table.
First Solar Inc Insider Transactions
William J Post Mailing Address
Above is the net worth, insider trading, and ownership report for William J Post. Based on the public information released on the U.S. Securities and Exchange Commission (SEC) website, William J Post's mailing address is: Phoenix Az 85004.